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Linux/kernel/crash_core.c

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  1 /*
  2  * crash.c - kernel crash support code.
  3  * Copyright (C) 2002-2004 Eric Biederman  <ebiederm@xmission.com>
  4  *
  5  * This source code is licensed under the GNU General Public License,
  6  * Version 2.  See the file COPYING for more details.
  7  */
  8 
  9 #include <linux/crash_core.h>
 10 #include <linux/utsname.h>
 11 #include <linux/vmalloc.h>
 12 
 13 #include <asm/page.h>
 14 #include <asm/sections.h>
 15 
 16 /* vmcoreinfo stuff */
 17 static unsigned char *vmcoreinfo_data;
 18 static size_t vmcoreinfo_size;
 19 u32 *vmcoreinfo_note;
 20 
 21 /* trusted vmcoreinfo, e.g. we can make a copy in the crash memory */
 22 static unsigned char *vmcoreinfo_data_safecopy;
 23 
 24 /*
 25  * parsing the "crashkernel" commandline
 26  *
 27  * this code is intended to be called from architecture specific code
 28  */
 29 
 30 
 31 /*
 32  * This function parses command lines in the format
 33  *
 34  *   crashkernel=ramsize-range:size[,...][@offset]
 35  *
 36  * The function returns 0 on success and -EINVAL on failure.
 37  */
 38 static int __init parse_crashkernel_mem(char *cmdline,
 39                                         unsigned long long system_ram,
 40                                         unsigned long long *crash_size,
 41                                         unsigned long long *crash_base)
 42 {
 43         char *cur = cmdline, *tmp;
 44 
 45         /* for each entry of the comma-separated list */
 46         do {
 47                 unsigned long long start, end = ULLONG_MAX, size;
 48 
 49                 /* get the start of the range */
 50                 start = memparse(cur, &tmp);
 51                 if (cur == tmp) {
 52                         pr_warn("crashkernel: Memory value expected\n");
 53                         return -EINVAL;
 54                 }
 55                 cur = tmp;
 56                 if (*cur != '-') {
 57                         pr_warn("crashkernel: '-' expected\n");
 58                         return -EINVAL;
 59                 }
 60                 cur++;
 61 
 62                 /* if no ':' is here, than we read the end */
 63                 if (*cur != ':') {
 64                         end = memparse(cur, &tmp);
 65                         if (cur == tmp) {
 66                                 pr_warn("crashkernel: Memory value expected\n");
 67                                 return -EINVAL;
 68                         }
 69                         cur = tmp;
 70                         if (end <= start) {
 71                                 pr_warn("crashkernel: end <= start\n");
 72                                 return -EINVAL;
 73                         }
 74                 }
 75 
 76                 if (*cur != ':') {
 77                         pr_warn("crashkernel: ':' expected\n");
 78                         return -EINVAL;
 79                 }
 80                 cur++;
 81 
 82                 size = memparse(cur, &tmp);
 83                 if (cur == tmp) {
 84                         pr_warn("Memory value expected\n");
 85                         return -EINVAL;
 86                 }
 87                 cur = tmp;
 88                 if (size >= system_ram) {
 89                         pr_warn("crashkernel: invalid size\n");
 90                         return -EINVAL;
 91                 }
 92 
 93                 /* match ? */
 94                 if (system_ram >= start && system_ram < end) {
 95                         *crash_size = size;
 96                         break;
 97                 }
 98         } while (*cur++ == ',');
 99 
100         if (*crash_size > 0) {
101                 while (*cur && *cur != ' ' && *cur != '@')
102                         cur++;
103                 if (*cur == '@') {
104                         cur++;
105                         *crash_base = memparse(cur, &tmp);
106                         if (cur == tmp) {
107                                 pr_warn("Memory value expected after '@'\n");
108                                 return -EINVAL;
109                         }
110                 }
111         } else
112                 pr_info("crashkernel size resulted in zero bytes\n");
113 
114         return 0;
115 }
116 
117 /*
118  * That function parses "simple" (old) crashkernel command lines like
119  *
120  *      crashkernel=size[@offset]
121  *
122  * It returns 0 on success and -EINVAL on failure.
123  */
124 static int __init parse_crashkernel_simple(char *cmdline,
125                                            unsigned long long *crash_size,
126                                            unsigned long long *crash_base)
127 {
128         char *cur = cmdline;
129 
130         *crash_size = memparse(cmdline, &cur);
131         if (cmdline == cur) {
132                 pr_warn("crashkernel: memory value expected\n");
133                 return -EINVAL;
134         }
135 
136         if (*cur == '@')
137                 *crash_base = memparse(cur+1, &cur);
138         else if (*cur != ' ' && *cur != '\0') {
139                 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
140                 return -EINVAL;
141         }
142 
143         return 0;
144 }
145 
146 #define SUFFIX_HIGH 0
147 #define SUFFIX_LOW  1
148 #define SUFFIX_NULL 2
149 static __initdata char *suffix_tbl[] = {
150         [SUFFIX_HIGH] = ",high",
151         [SUFFIX_LOW]  = ",low",
152         [SUFFIX_NULL] = NULL,
153 };
154 
155 /*
156  * That function parses "suffix"  crashkernel command lines like
157  *
158  *      crashkernel=size,[high|low]
159  *
160  * It returns 0 on success and -EINVAL on failure.
161  */
162 static int __init parse_crashkernel_suffix(char *cmdline,
163                                            unsigned long long   *crash_size,
164                                            const char *suffix)
165 {
166         char *cur = cmdline;
167 
168         *crash_size = memparse(cmdline, &cur);
169         if (cmdline == cur) {
170                 pr_warn("crashkernel: memory value expected\n");
171                 return -EINVAL;
172         }
173 
174         /* check with suffix */
175         if (strncmp(cur, suffix, strlen(suffix))) {
176                 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
177                 return -EINVAL;
178         }
179         cur += strlen(suffix);
180         if (*cur != ' ' && *cur != '\0') {
181                 pr_warn("crashkernel: unrecognized char: %c\n", *cur);
182                 return -EINVAL;
183         }
184 
185         return 0;
186 }
187 
188 static __init char *get_last_crashkernel(char *cmdline,
189                              const char *name,
190                              const char *suffix)
191 {
192         char *p = cmdline, *ck_cmdline = NULL;
193 
194         /* find crashkernel and use the last one if there are more */
195         p = strstr(p, name);
196         while (p) {
197                 char *end_p = strchr(p, ' ');
198                 char *q;
199 
200                 if (!end_p)
201                         end_p = p + strlen(p);
202 
203                 if (!suffix) {
204                         int i;
205 
206                         /* skip the one with any known suffix */
207                         for (i = 0; suffix_tbl[i]; i++) {
208                                 q = end_p - strlen(suffix_tbl[i]);
209                                 if (!strncmp(q, suffix_tbl[i],
210                                              strlen(suffix_tbl[i])))
211                                         goto next;
212                         }
213                         ck_cmdline = p;
214                 } else {
215                         q = end_p - strlen(suffix);
216                         if (!strncmp(q, suffix, strlen(suffix)))
217                                 ck_cmdline = p;
218                 }
219 next:
220                 p = strstr(p+1, name);
221         }
222 
223         if (!ck_cmdline)
224                 return NULL;
225 
226         return ck_cmdline;
227 }
228 
229 static int __init __parse_crashkernel(char *cmdline,
230                              unsigned long long system_ram,
231                              unsigned long long *crash_size,
232                              unsigned long long *crash_base,
233                              const char *name,
234                              const char *suffix)
235 {
236         char    *first_colon, *first_space;
237         char    *ck_cmdline;
238 
239         BUG_ON(!crash_size || !crash_base);
240         *crash_size = 0;
241         *crash_base = 0;
242 
243         ck_cmdline = get_last_crashkernel(cmdline, name, suffix);
244 
245         if (!ck_cmdline)
246                 return -EINVAL;
247 
248         ck_cmdline += strlen(name);
249 
250         if (suffix)
251                 return parse_crashkernel_suffix(ck_cmdline, crash_size,
252                                 suffix);
253         /*
254          * if the commandline contains a ':', then that's the extended
255          * syntax -- if not, it must be the classic syntax
256          */
257         first_colon = strchr(ck_cmdline, ':');
258         first_space = strchr(ck_cmdline, ' ');
259         if (first_colon && (!first_space || first_colon < first_space))
260                 return parse_crashkernel_mem(ck_cmdline, system_ram,
261                                 crash_size, crash_base);
262 
263         return parse_crashkernel_simple(ck_cmdline, crash_size, crash_base);
264 }
265 
266 /*
267  * That function is the entry point for command line parsing and should be
268  * called from the arch-specific code.
269  */
270 int __init parse_crashkernel(char *cmdline,
271                              unsigned long long system_ram,
272                              unsigned long long *crash_size,
273                              unsigned long long *crash_base)
274 {
275         return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
276                                         "crashkernel=", NULL);
277 }
278 
279 int __init parse_crashkernel_high(char *cmdline,
280                              unsigned long long system_ram,
281                              unsigned long long *crash_size,
282                              unsigned long long *crash_base)
283 {
284         return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
285                                 "crashkernel=", suffix_tbl[SUFFIX_HIGH]);
286 }
287 
288 int __init parse_crashkernel_low(char *cmdline,
289                              unsigned long long system_ram,
290                              unsigned long long *crash_size,
291                              unsigned long long *crash_base)
292 {
293         return __parse_crashkernel(cmdline, system_ram, crash_size, crash_base,
294                                 "crashkernel=", suffix_tbl[SUFFIX_LOW]);
295 }
296 
297 Elf_Word *append_elf_note(Elf_Word *buf, char *name, unsigned int type,
298                           void *data, size_t data_len)
299 {
300         struct elf_note *note = (struct elf_note *)buf;
301 
302         note->n_namesz = strlen(name) + 1;
303         note->n_descsz = data_len;
304         note->n_type   = type;
305         buf += DIV_ROUND_UP(sizeof(*note), sizeof(Elf_Word));
306         memcpy(buf, name, note->n_namesz);
307         buf += DIV_ROUND_UP(note->n_namesz, sizeof(Elf_Word));
308         memcpy(buf, data, data_len);
309         buf += DIV_ROUND_UP(data_len, sizeof(Elf_Word));
310 
311         return buf;
312 }
313 
314 void final_note(Elf_Word *buf)
315 {
316         memset(buf, 0, sizeof(struct elf_note));
317 }
318 
319 static void update_vmcoreinfo_note(void)
320 {
321         u32 *buf = vmcoreinfo_note;
322 
323         if (!vmcoreinfo_size)
324                 return;
325         buf = append_elf_note(buf, VMCOREINFO_NOTE_NAME, 0, vmcoreinfo_data,
326                               vmcoreinfo_size);
327         final_note(buf);
328 }
329 
330 void crash_update_vmcoreinfo_safecopy(void *ptr)
331 {
332         if (ptr)
333                 memcpy(ptr, vmcoreinfo_data, vmcoreinfo_size);
334 
335         vmcoreinfo_data_safecopy = ptr;
336 }
337 
338 void crash_save_vmcoreinfo(void)
339 {
340         if (!vmcoreinfo_note)
341                 return;
342 
343         /* Use the safe copy to generate vmcoreinfo note if have */
344         if (vmcoreinfo_data_safecopy)
345                 vmcoreinfo_data = vmcoreinfo_data_safecopy;
346 
347         vmcoreinfo_append_str("CRASHTIME=%ld\n", get_seconds());
348         update_vmcoreinfo_note();
349 }
350 
351 void vmcoreinfo_append_str(const char *fmt, ...)
352 {
353         va_list args;
354         char buf[0x50];
355         size_t r;
356 
357         va_start(args, fmt);
358         r = vscnprintf(buf, sizeof(buf), fmt, args);
359         va_end(args);
360 
361         r = min(r, (size_t)VMCOREINFO_BYTES - vmcoreinfo_size);
362 
363         memcpy(&vmcoreinfo_data[vmcoreinfo_size], buf, r);
364 
365         vmcoreinfo_size += r;
366 }
367 
368 /*
369  * provide an empty default implementation here -- architecture
370  * code may override this
371  */
372 void __weak arch_crash_save_vmcoreinfo(void)
373 {}
374 
375 phys_addr_t __weak paddr_vmcoreinfo_note(void)
376 {
377         return __pa(vmcoreinfo_note);
378 }
379 
380 static int __init crash_save_vmcoreinfo_init(void)
381 {
382         vmcoreinfo_data = (unsigned char *)get_zeroed_page(GFP_KERNEL);
383         if (!vmcoreinfo_data) {
384                 pr_warn("Memory allocation for vmcoreinfo_data failed\n");
385                 return -ENOMEM;
386         }
387 
388         vmcoreinfo_note = alloc_pages_exact(VMCOREINFO_NOTE_SIZE,
389                                                 GFP_KERNEL | __GFP_ZERO);
390         if (!vmcoreinfo_note) {
391                 free_page((unsigned long)vmcoreinfo_data);
392                 vmcoreinfo_data = NULL;
393                 pr_warn("Memory allocation for vmcoreinfo_note failed\n");
394                 return -ENOMEM;
395         }
396 
397         VMCOREINFO_OSRELEASE(init_uts_ns.name.release);
398         VMCOREINFO_PAGESIZE(PAGE_SIZE);
399 
400         VMCOREINFO_SYMBOL(init_uts_ns);
401         VMCOREINFO_SYMBOL(node_online_map);
402 #ifdef CONFIG_MMU
403         VMCOREINFO_SYMBOL(swapper_pg_dir);
404 #endif
405         VMCOREINFO_SYMBOL(_stext);
406         VMCOREINFO_SYMBOL(vmap_area_list);
407 
408 #ifndef CONFIG_NEED_MULTIPLE_NODES
409         VMCOREINFO_SYMBOL(mem_map);
410         VMCOREINFO_SYMBOL(contig_page_data);
411 #endif
412 #ifdef CONFIG_SPARSEMEM
413         VMCOREINFO_SYMBOL_ARRAY(mem_section);
414         VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS);
415         VMCOREINFO_STRUCT_SIZE(mem_section);
416         VMCOREINFO_OFFSET(mem_section, section_mem_map);
417 #endif
418         VMCOREINFO_STRUCT_SIZE(page);
419         VMCOREINFO_STRUCT_SIZE(pglist_data);
420         VMCOREINFO_STRUCT_SIZE(zone);
421         VMCOREINFO_STRUCT_SIZE(free_area);
422         VMCOREINFO_STRUCT_SIZE(list_head);
423         VMCOREINFO_SIZE(nodemask_t);
424         VMCOREINFO_OFFSET(page, flags);
425         VMCOREINFO_OFFSET(page, _refcount);
426         VMCOREINFO_OFFSET(page, mapping);
427         VMCOREINFO_OFFSET(page, lru);
428         VMCOREINFO_OFFSET(page, _mapcount);
429         VMCOREINFO_OFFSET(page, private);
430         VMCOREINFO_OFFSET(page, compound_dtor);
431         VMCOREINFO_OFFSET(page, compound_order);
432         VMCOREINFO_OFFSET(page, compound_head);
433         VMCOREINFO_OFFSET(pglist_data, node_zones);
434         VMCOREINFO_OFFSET(pglist_data, nr_zones);
435 #ifdef CONFIG_FLAT_NODE_MEM_MAP
436         VMCOREINFO_OFFSET(pglist_data, node_mem_map);
437 #endif
438         VMCOREINFO_OFFSET(pglist_data, node_start_pfn);
439         VMCOREINFO_OFFSET(pglist_data, node_spanned_pages);
440         VMCOREINFO_OFFSET(pglist_data, node_id);
441         VMCOREINFO_OFFSET(zone, free_area);
442         VMCOREINFO_OFFSET(zone, vm_stat);
443         VMCOREINFO_OFFSET(zone, spanned_pages);
444         VMCOREINFO_OFFSET(free_area, free_list);
445         VMCOREINFO_OFFSET(list_head, next);
446         VMCOREINFO_OFFSET(list_head, prev);
447         VMCOREINFO_OFFSET(vmap_area, va_start);
448         VMCOREINFO_OFFSET(vmap_area, list);
449         VMCOREINFO_LENGTH(zone.free_area, MAX_ORDER);
450         log_buf_vmcoreinfo_setup();
451         VMCOREINFO_LENGTH(free_area.free_list, MIGRATE_TYPES);
452         VMCOREINFO_NUMBER(NR_FREE_PAGES);
453         VMCOREINFO_NUMBER(PG_lru);
454         VMCOREINFO_NUMBER(PG_private);
455         VMCOREINFO_NUMBER(PG_swapcache);
456         VMCOREINFO_NUMBER(PG_slab);
457 #ifdef CONFIG_MEMORY_FAILURE
458         VMCOREINFO_NUMBER(PG_hwpoison);
459 #endif
460         VMCOREINFO_NUMBER(PG_head_mask);
461         VMCOREINFO_NUMBER(PAGE_BUDDY_MAPCOUNT_VALUE);
462 #ifdef CONFIG_HUGETLB_PAGE
463         VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
464 #endif
465 
466         arch_crash_save_vmcoreinfo();
467         update_vmcoreinfo_note();
468 
469         return 0;
470 }
471 
472 subsys_initcall(crash_save_vmcoreinfo_init);
473 

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